Please check your database hostname and database name, because both of them are invalid. You can find them in the MySQL Databases section in your control panel.
Also, never, ever share your account password with anyone. I’ve changed your account password to prevent anyone else from getting access to your account, but you must make sure you never share it again by accident. InfinityFree will never ask you for your hosting account password.
The error message Access denied for user 'epiz_20650100'@'192.168.0.47' (using password: NO) means you are not using a password. Please check your database connection code to make sure your password is actually used.
I checked your website and I see you have a few HTML and PHP files. However, in them you reference a lot of CSS and JS files as well, none of which have been uploaded to your account (and the URLs are invalid as well). Please double check whether all files are truly present.